S-Stage Bore Up Kit 145cc (Camshaft Not Included) - Monkey 125

【SP武川 01-05-5460 S-Stage Bore Up Kit 145cc, No Cam, Monkey 125 Engine Parts, Takegawa】
■Product Description
Enjoy torque-rich power output not found in stock engines.

■Detailed Description
By changing the cylinder and piston, the displacement can be changed from the stock 124cc to 145cc.
When installed simultaneously with the FI-Con TYPE-X (injection controller), it achieves torque-rich power characteristics different from stock.
The cylinder adopts an aluminum iron sleeve cylinder.
Bore diameter 54mm. Stroke 63.1mm (stock). Compression ratio 11.2:1.
Since an SP Takegawa M5 temperature sensor can be attached to the cylinder, you can measure the cylinder temperature by purchasing a separate thermometer (Compact LED Thermometer with M5 Temperature Sensor).
There are two types of S-Stage bore up kits: one without a sport camshaft and one with a sport camshaft.

■Compatible Models
HONDA
Monkey 125 (JB03/JB05-1000001～)

■Notes
*Images are for illustration purposes only. Includes products with different sizes and colors.
*Product design and specifications are subject to change without notice. Please understand.
*When installing the S-Stage bore up kit, simultaneous installation of the FI-Con TYPE-X (injection controller) is required.
*Since the displacement will be 125cc or more, it is not possible to ride on public roads under light motorcycle registration (Class 2). It is for competition use only.
*Due to the significant increase in engine output and torque when installing the SP Takegawa bore up kit, the crankshaft will be subjected to increased stress such as twisting and deflection. To reduce the load on the crankshaft, SP Takegawa recommends installing a crankshaft support adapter simultaneously. The crankshaft support adapter enhances crankshaft durability by adding ball bearing support to the end of the crankshaft flywheel side, thereby suppressing twisting and deflection.